netIP_aton fucntion not working (TCP CLIENT)

Hello

I am using stm32 discovery board and trying to implement a TCP Client application.In the following code, I am using netIP_aton function to convert the network address in binary.But the function fails to convert it and returns a false value.Can anyone please help me out?
Here is the main code

int main (void) {
 uint8_t ip_addr[NET_ADDR_IP4_LEN];
NET_ADDR addr = { NET_ADDR_IP4,1000,192,168,0,100};
        netStatus status;
  MPU_Config();
  CPU_CACHE_Enable();
  HAL_Init();
SystemClock_Config();
status= netInitialize();

printf("Connected\n");
netIP_aton(buffer, NET_ADDR_IP6, &ip_addr[0]);

tcp_sock = netTCP_GetSocket (tcp_cb_client);
if(tcp_sock<0)
{
printf("socket get failed\n");
}
else if(tcp_sock>0)
{
printf("socket number = %d\n",tcp_sock);
}
netIP_aton(buffer, NET_ADDR_IP4, &ip_addr[0]);
osDelay(10);
if(x==true)
printf("conversion successfull");
else if(x==false)
printf("conversion failed");


printf("The ip address in binary form is %d.%d.%d.%d",ip_addr[0],ip_addr[1],ip_addr[2],ip_addr[3]);
netTCP_Connect (tcp_sock, (NET_ADDR*)&addr, 0);
osDelay(500);
printf("connecting to socket");
for(;;)
{
switch(netTCP_GetState(tcp_sock)){
  case netTCP_StateCLOSED:
  case  netTCP_StateUNUSED:   // Failed to connect to TCP socket server
                printf("connection not made yet\n");
        return 0;

    case netTCP_StateESTABLISHED:
      // Connected, socket is ready to send data
  printf("connection has been made successfully");
                break;
  }

osDelay(10);
}
}